Go Back  Offshoreonly.com > Technical > General Q & A
Wow !!!!!!!!!!!! >

Wow !!!!!!!!!!!!

Notices

Wow !!!!!!!!!!!!

Old 05-24-2007, 02:13 PM
  #1  
Registered
Thread Starter
 
Join Date: Apr 2007
Posts: 32
Likes: 0
Received 0 Likes on 0 Posts
Default Wow !!!!!!!!!!!!

Is it just me or what. For a 496HO (425hp) Mercruiser wants roughly 14g's ready to drop in without exhaust. For $7500 i can get a zz502 (502hp), there are a few changes that others suggest(distributor,cam,valves,marinize the carb) but i see some running it with the original zz cam,lifters, and valves. Even if i swap them out i am way under 14g's. Am i missing something from the list to convert the ZZ502 over for my boat that i have not listed.
speediseverything is offline  
Old 05-24-2007, 02:28 PM
  #2  
Registered
 
BY U BOY's Avatar
 
Join Date: Aug 2005
Location: HOUSTON ,TX
Posts: 8,779
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by speediseverything
Is it just me or what. For a 496HO (425hp) Mercruiser wants roughly 14g's ready to drop in without exhaust. For $7500 i can get a zz502 (502hp), there are a few changes that others suggest(distributor,cam,valves,marinize the carb) but i see some running it with the original zz cam,lifters, and valves. Even if i swap them out i am way under 14g's. Am i missing something from the list to convert the ZZ502 over for my boat that i have not listed.


brass freez plugs.

I have an old 7.4l that i am running the zz502 cam,heads and intake on and have had no reversion issues. I am thinking about changing the cam to get that little extra hp
BY U BOY is offline  
Old 05-24-2007, 02:35 PM
  #3  
Registered
Platinum Member
 
Join Date: Jun 2006
Location: Lake Conroe, TX.
Posts: 14,914
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by BY U BOY
brass freez plugs.

I have an old 7.4l that i am running the zz502 cam,heads and intake on and have had no reversion issues. I am thinking about changing the cam to get that little extra hp
Buy U, I can get you a matching cam for the motors I just built for $100. $75 for the lifters. New in the box. You'll like it much better.
jeff1000man is offline  
Old 05-24-2007, 02:42 PM
  #4  
Registered
 
copiercat's Avatar
 
Join Date: Feb 2005
Location: nokomis florida
Posts: 405
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by speediseverything
Am i missing something from the list to convert the ZZ502 over for my boat that i have not listed.
probably just the black "gold" paint
copiercat is offline  
Old 05-24-2007, 02:48 PM
  #5  
Banned
 
cuda's Avatar
 
Join Date: Sep 2001
Location: Deland, Florida
Posts: 25,191
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by speediseverything
Is it just me or what. For a 496HO (425hp) Mercruiser wants roughly 14g's ready to drop in without exhaust. For $7500 i can get a zz502 (502hp), there are a few changes that others suggest(distributor,cam,valves,marinize the carb) but i see some running it with the original zz cam,lifters, and valves. Even if i swap them out i am way under 14g's. Am i missing something from the list to convert the ZZ502 over for my boat that i have not listed.
Just the warranty if it pukes.
cuda is offline  
Old 05-24-2007, 03:23 PM
  #6  
Registered
Platinum Member
 
Join Date: Jun 2006
Location: Lake Conroe, TX.
Posts: 14,914
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by cuda
Just the warranty if it pukes.
Yes that is the truth.

I know a guy that is having awesome reliablity with the GM Towing crate engines. They are around $5800 a piece. make 500 lbs of torque below 4000. They came with everything except exhaust and sea water pumps. He dropped them in and never looked back 4 years ago. He rarely even changes the oil. Go figure.
jeff1000man is offline  
Old 05-25-2007, 12:31 AM
  #7  
Registered
Thread Starter
 
Join Date: Apr 2007
Posts: 32
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by BY U BOY
brass freez plugs.

I have an old 7.4l that i am running the zz502 cam,heads and intake on and have had no reversion issues. I am thinking about changing the cam to get that little extra hp
I was told that the brass freeze plugs were for salt water use only and not needed for fresh water. Looks like a ZZ502 is in the near future.
speediseverything is offline  
Old 05-25-2007, 06:02 AM
  #8  
Registered
 
dean51267's Avatar
 
Join Date: Jan 2005
Location: Paducah, KY
Posts: 4,601
Likes: 0
Received 0 Likes on 0 Posts
Default

everyone "knows a guy" who put a car engine in and it worked......

and everyone knows a few guys who it did not work for....

the merc stuff works, time and time again, over and over, right out of the box.

One mis-step with the zz-502 and you lose a motor, then you are spending more than the 496 ho cost. Plus you lost all boating season screwing with it, and to get it right will now cost $20K instead of $14K.

I been down the road you are going on, and strongly advise against it.
dean51267 is offline  
Old 05-25-2007, 08:44 AM
  #9  
Registered
Platinum Member
 
Join Date: Jun 2006
Location: Lake Conroe, TX.
Posts: 14,914
Likes: 0
Received 1 Like on 1 Post
Default

What kind of engine are you running now?
jeff1000man is offline  
Old 05-25-2007, 10:23 AM
  #10  
Registered
 
Join Date: Jan 2004
Location: San Diego, California
Posts: 2,777
Likes: 0
Received 6 Likes on 6 Posts
Wink Apples & Oranges

Comparing the price of a Merc 496HO fully marine equipped to a crate 502 is not even a close comparison.
Take the 502 and change the camshaft, add coplete electronice EFI fuel system, add closed cooling, oil and powersteering coolers, marine motor mounts, bravo bellhousing, bravo coupler, raw water pump system, complete engine harness, coil near plug iginition system, ECM , etc, etc, etc, and you will be well above $14K. You are comparing apples and oranges! The only thing you really get when you try to get a fully equipped reliable marine high performance engine for "almost nothing" is Nothing!
Good Luck!

Regards,
Ray @ Raylar
Raylar is offline  

Quick Reply: Wow !!!!!!!!!!!!


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.